Jesus tells us not to practice religion for show. (Matthew 6) If so, you will have no reward in Heaven for your good works. (6:1) That is because you received the attention you sought on earth and that was your reward. Giving to the needy need not be announced, praying is not to show how good you are. Motives are important to God. He wants your heart, not your demonstration. Prayer is to talk directly to God. Therefore, the first thing in prayer, according to Jesus, is praise: "hallowed be your name".